Pan Am window repair parts needed

A home owner from North Fort Myers, FL says:
Like me, the aging joints on my Pan Am window require repair or replacement. I don't know the names, but I've attached photos with measurements. Pictured is the attachment on the left side (from outside looking in.) The right side is also broken, but the entire nylon piece is missing, Thanks for any help!
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Dave Sr. from SWISCO responded:

Thanks for your patience in this busy season. I'm not sure if your parts are still available, but I've made a list of possible replacement options for you on this page. Look them over and see if you could adapt any to work on your window. 

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